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Hi. It depends if the knock goes away after the engine warms up. If it does, then yes, this is contributing to the knock. What is happening is that the fuel and chamber is not hot enough for combustion and there is not enough compression built up in the engine yet. It is always best to test all glow plugs and replace if needed.

If the knock is not going away that is a good indication that the injector has failed. If you need help verifying the fault, a certified technician from YourMechanic can come to your car’s location to diagnose the knocking issue and move forward with repairs.

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